Elbow-bending machine



June 1 1926. 1,587,158

M. HUSID ELBOW BENDING MACHINE Filed Jan. 11, 1926 3 Sheets-Sheet 1 INVENTOR. MOFI'; /d

A TTORNE Y June 1 1926. 1,587,158

r M. HUSID ELBOW BENDING MACHINE Filed Jan. 11, 1926 3 Sheets-Sheet 2 INVENTOR. MOP/ll? us/d, BY dgww' ATTORNEY June 1 1926.

M. HUSID ELBOW BENDING MACHINE 3 Sheets-Sheet 3 Filed Jan. 11. 1926 INVENTOR. Mark/ 5 fl ATTORNEY Patented June 1, 1926.

PATENT OFFICE.

MORRIS HUSID, F BROOKLYN, NEW YORK- ELBOW-BENDING MACHINE.

Application filed January 11, 1926. Serial No. 80,463.

My invention relates to machines for bond ing sheet-metal pipes and has for its main object to provide a machine on which pipes of various cross-sectional shapes and of a comparatively wire range of sizes may be bent at a large variety of angles.

A further object is to produce a machine in which the tools may be readily and speedily changed.

A further object is to provide a machine of simple construction, semi-automatic in operation, of few parts, easily accessible for adjustments and repairs, and comparatively inexpensive to manufacture.

A still further object is to so construct the machine that but little skill is required on the part of the operator.

These and various other objects and advantages will be clearly understood from the following description and from the accom- JRII lII drawin s of a referred embodiment but it will be understood that various modifications might be made without departing from the scope of the invention.

Fig. 1 is a front elevation of the machine.

Fig. 2 is a cross-sectional side elevation, taken on line 2-2.

Fig. 3 is a plan view.

Fig. 4 is a front View of certain details of the crimping mechanism.

Fig. 5 is a cross-sectional side view of the bending tools.

Fig. 6 is a rear view of the carriage.

Fig. 7 is a planview of Fig. 6, only part of the carriage being shown.

Fig. 8 is a front view of certain members of the belt shifting mechanism, partly in cross-section. v

Fig. 9 is a side elevation of the members shown in Fig. 8.

Figs. 5, 6 and 7 are drawn to a larger scale than the remaining views.

Referring now particularly to Figs. 1, 2 and 3; 10 is the rectangular base frame on which the various members are supported, 11 the front legs and 12 the rear legs which support the base. The legs are braced by means of the rods 13.

The front frame 14, the intermediate frame 15 and the rear frame 16 are all rigidly attached to the base 10 and connected, at their tops, by the rod 17 on which spacing tubes 18 and 19 are inserted between the frames so that, when the nuts 20 and 21 are tightened, the frames are held in a rigid spaced relation to each other. The three frames are all of the general outline shown by the front frame 14 on Fig. 1, except as to certain brackets which will be explained as the description proceeds.

The mandrel 22 extends through all three frames and is reciprocatingly supported in the bearings 23 and 24 formed respectively on the intermediate and rear frames. The mandrel is not supported in the front frame and is prevented from rotating by thekey 25, rigidly held in the bearing 24 and engaging in the keyway 26 cut in the mandrel.

The intermediate frame is provided with a bracket terminating in a bearing-.27 and the rear frame with a bracket terminating in a bearing 28; in these hearings, the shaft 29 is supported. Rotatingly mounted on this shaft are six pulleys 30, 31, 32, 33, 34, and 35. The pulley 30 is rigidly connected, by means of a hub 36, to a pinion 37. The pulleys 33 and 34 are rigidly connected, by means of hubs 38 and 39, with a larger pinion 40. The pulleys 31, 32 and 35 are independent, loose pulleys. 41 shows a spacing collar placed between the pulley 35 and the bearing 28. The object of these pulleys will be explained later. Their arrangement is plainly shown on Fig. 3.

The pinion 37 drives a gear 42 located in the rear of the intermediate frame and rigidly mounted on a shaft 43. On this shaft,

but in front of the intermediate frame, another gear 44 is rigidly mounted. The gear 44 meshes with a gear 45 rigidly mounted on a shaft 46. The shafts 43 and 46 are rotatingly mounted in the front and intermediate frames and are provided with eccentrics 47 and 48 at their front ends. As the'gears44 and 45 are of equal size, it will be seen that when the gear 42 is revolved, the eccentrics will turn in unison but in op posite directions. These eccentrics extend outside the front frame. I

Referring now more particularly to Figs. 1 and 2: On the front of the front frame 14, a cross-head 49 is vertically slidably mounted in the guides 50 and 51. Openings 52 and 53 are formed in the cross-head and in these openings the eccentrics 47 and 48 0perate. It willbe readily seen that, as the eccentrices revolve, the cross-head will be moved up and down.

The cross-head 49 operates [the crimping mechanism and is provided at its lower end with two seats 54 and 55, in which the crimping punch holders 56 and '57 are free to swivel on the pins 58 and 59. Each of the punch holders is provided with an angular cam-slot 60 operating, respectively, on the headed studs 62 and 63. The studs are rigidly attached in the front frame. The crimping punches 6 f and G5 are attached in the holders 56 and 57 in any suitable manner.

For illustration, a rectangular pipe 06 is shown in the drawing but it will be understood that any other shape may be bent on the machine.

Referring now also to the enlarged view Fig. 5, in which a crimping punch is shown at 64 and the rectangular pipe at 00, it will be noted that the mandrel 22 is provided at its front end with a reduced, shouldered part 67, threaded at its outer end. On this reduced part, the crimping die 08 held be: tween the shoulder formed by the mandrel 22 and the nut 69. The configuration of this die is such that it fits in the pipe 66 and is provided with a groove 70 into which the metal of the pipe is forced by the action of the punches 64 and 65. The groove, which is formed on three sides of the die only, is deepest at the top and decreases in depth, on both sides, towards the bottom. The punches 64 and 65 are similarly shaped, as plainly shown on Figs. 1 and i. The groove 70, however, is of greater depth than that to which the metal is depressed.

It will be readily seen, by referring to Figs. 1 and l, that the action of the eccentries 47 and 48 on the cross-head 49 causes the punches to crimp the pipe. as shown in Fig. 5. It will also be seen that when the cross-head is in the position shown on Fig. 4, the punches are entirely free of th pipe so that it may be freely moved.

The crimping die 68 also acts as a folding punch in combination with the fol sing die 71. This folding die, which is slightly larger than the pipe 06 and has the same configuration, is held in a rectangular seat in the front frame. The operating edge of the die is somewhat bell mouthed and the operating edge of the punch 68 is also slightly rounded.

It will be seen that if, after the punches 64- and G5 are withdrawn from the crimp 72, the punch 68 is drawn rearward, the crimp, by the action of the punch 08 and die 71, will be folded as shown in the previous fold 73, on Fig. 5.

The rearward action is obtained in the following manner: By referring to 2, it will be noted that the mandrel is provided with an enlarged threaded portion 74;. It will be remembered that the mandrel is prevented from rotating by the key An internally threaded gear 75 oerates on this threaded portion and is driven by the pinion 40. It will be seen that rotation of the gear 75 in alternating directions will cause reciprocation of the mandrel 22 and consequently of the punch 68.

As the bending of the pipe is accomplished by a succession of crimpings and foldings, it is obvious that the pipe must be advanced through the die 71 in a succession of regular steps. This is accomplished in the manner now to be explained.

Referring now to Figs. 3, 6 and 7; a carriage is indicated in its entirety by 7 6. This carriage, the body part of which is circular, is provided with two arms 77 and 78 and has three circular holes, one through each of the arms and one through the body part, by means of which it slides on two rods 79 and 80 and on the mandrel 22. These rods are rigidly secured between the front and intermediate frames. On the rear of the carriage, four pawls 81 and 82 are mounted. These pawls engage in notches 88 and 84. cut in the mandrel and in the rods 79 and 80. The mandrel is provided with two series of notches while the rods are only provided with one series each. The pawls are provided with tails and are held in engage ment with their respective notches by compression springs 86, acting against these tails.

When the mandrel 22 is drawn backward, the carriage is held stationary by the pawls 81 while the pawls 82, due to their shape and the angularity of the notches, are raised out of the notches 84. A forward movement of the mandrel reverses this action and the carriage is moved forward by the action of the notches 8d and the pawls 82. In this manner, by successive reciprocation of the mandrel, the carriage is moved forward notch by notch until the required number of folds are made in the pipe.

To restore the carriage to its rearmost position, the pawl releasing devices are provided. Each of these consist of a yoke 89, straddling the arms 77 and 78 and pivoted by the screws 90 to these arms, a hand grip 91, and a release lever 92. Fig. 7 plainly shows how a pressure, as indicated by the arrow, 011 the hand grips first releases the pawls and then slides the carriage backward.

Referring again to Figs. 1, 2 and 3; the front and rear frames are each provided with a guide 93 and 94:, respectively, in which slides a belt-shifting bar 95. This bar is provided with levers 96 and 97, pivoted at their upper ends to the bar and at their lower ends to brackets 98 and 99 se cured, respectively, on the rear of the front and rear frames. An operating handle 100 is riveted on the lever 96 and belt shifters 101 and 102 are secured on the bar 95.

Another belt-shifting bar 103 is slidably mounted in guides 10 i and 105. The guide 10: is formed on a bracket 106 secured on the front of the rear frame and the guide is secured directly on the rear frame.

This bar is provided with a belt shifter 107. A lever 108 has its upper end pivoted to the bar 103 and its'lower end to a bracket 109 secured on the rear of the rear frame.

A bifurcated lever 110, having one long arm 112 and one short arm 111, is pivotally mounted on a bracket 113, as plainly shown on Fig. 3. One end of this lever is located between two stops 11 1 and 115, adjustably secured on the reduced rear end 116 of the mandrel 22, and is actuated by these stops when the mandrel reciprocates.

The complete operation of the machine will now be explained:

The carriage is placed at the desired position by means of the hand grips 91, the pipe to be bent is inserted through the opening in the die 71 and pushed against the carriage. A bushing 117, attached to the carriage, centers the pipe correctly. Three belts, which for the sake of simplicity have been omitted from the drawings, are running inside the belt shifters on the loose pulleys 31, 32 and 35, when the machine is idle.

A forward pull on the handle 100 will cause the belt in the shifter 101 to move from pulley 31 to pulley 30 and the belt in shifter 102 to move from pulley 32 to pulley 31. As the pulley 31 is loose, no motion is imparted to the machine from this pulley. The pulley 30, however, being attached to pinion 37, imparts movement to it and consequently operates the crimping mechanism.

Referring temporarily to Figs. 8 and 9; a. latch 118 is pivotally mounted on the front end of the intermediate frame, its rear end operated by a stud 119 secured on the gear 1st and its front end engaging on the underside of the bar 95 where a notch 120 is out. It will be seen that when the hand grip is pulled forward and the gear 4 1 starts to turn, the movement of the stud 119 allows the rear end of the latch to descend and the front end to engage in the notch 120, thus locking the bar 95 until the gear la returns to its original position and restores the latch. This prevents the operation of the folding mechanism until the crimping operation is completed. While the crimping operation is taking place, the operator exerts a rearward pressure on the hand grip; as soon as the crimp is completedand the latch restored, the bar 95 can be moved back and the shifters 101 and 102 will shift the belts to the pulleys 32 and 33 respectively. This stops the crimping mechanism and the pulley 33 now imparts rotation to the pinion 40, to which it is attached as previously explained. The rotation of the pinion 40 causes the gear to rotate and thus, through the thread 7-1, the mandrel is drawn rearward. As the carriage, and therefore the pipe, is stationary during this operation, the crimp just made is now folded by the action of the tools 68 and 71.

As the mandrel moves rearwardly, the

stop 114 engages the end of'the lever 110 causing the long arm 112 to engage first with the lever 97 and next with the lever 108. This in turn causes a forward movement of the bars 95 and 103, thus causing the shifters 101 and 102 to shifttheir respec-- the stop 115 engages the lever 110 thus, by

means of the short arm 111, engaging the lever 108 and shifting the belt in shifter 107 back to its original position on'loose pulley 35. Successive operations of the hand grip 100 will cause successive folds to be made on the pipe until the required number is obtained, when the elbow is removed and a new pipe is inserted.

It will be noted that by constructing the folding tools as shown and described, the folds will be formed on the outside of the pipe, thus maintaining the original inside diameter.

Having thus described my invention and its operation, what I claim as new and wish to protect by Letters Patent is- 1. In an elbow bending machine of the class described; a set of crimping punches; a combination crimping die and folding punch; a folding die; a slidable carriage; a combination of pulleys and gears for actuating said crimping punches, for reciprocating said combination crimping die and folding punch and for advancing said carriage in spaced successive steps; and belt shifting means for performing all of said operations in timed, successive sequence.

2. In an elbow bending machine of the class described; a set of crimping punches; a combination crimping die and folding punch; a folding die; a slidable carriage; a combination of pulleys and gears for actuating said crimping punches, for reciprocating said combination crimping die and folding punch and for advancing said carriage in spaced successive steps; belt shifting means for performing all of said operations in timed successive sequence; and means whereby, when the initial operation has been performed, the said belt shifting means are caused to act automatically until a complete cycle of operation has been performed.

3. In an elbow bending machine of the class described; a set of crimping punches; a combination crimping die and folding punch; a folding die; a slidable carriage; a

combination of pulleys and gears for actuperformed, the said belt shifting means are ating said crimping punches, for reciprocaused to act automatically until a complete 10 eating said combination crimping die and cycle of operations has been performed; and folding punch and for advancing said carpositive timing and locking means between riage in spaced successive steps; belt shiftsaid initial operation and said automatic ing means for performing all of said operoperation.

ations in timed, successive sequence; means whereby, when the initial operation has been MORRIS HUSID. 

